Photograph of Carl Sagan
Robert Reichert and Cornell University.
Carl Sagan is an American astronomer who was born in 1934.
He is famous for his research on the start of life and his belief
that life exists on other planets in the universe.
Sagan has played a leading role in the space program, and
in the recent spacecraft voyages to Mars and other
planets in our
Sagan passed away on December 20, 1996.
Shop Windows to the Universe Science Store!
Learn about Earth and space science, and have fun while doing it! The games
section of our online store
includes a climate change card game
and the Traveling Nitrogen game
You might also be interested in:
How did life evolve on Earth? The answer to this question can help us understand our past and prepare for our future. Although evolution provides credible and reliable answers, polls show that many people turn away from science, seeking other explanations with which they are more comfortable....more
At one time or another, we've probably all wondered how life first got started. This is not an easy question! There are at least three kinds of explanations for how life on Earth began: 1) Life was created....more
Where might we find extraterrestrial life in the solar system, and in what ways might an habitable place be different from Earth? Warmth? It seems that the temperature on Earth (room temperature, so to...more
Carl Sagan Stephen J. Gould Marie Curie Charles Darwin Louis Pasteur Leonardo Da Vinci ...more
Richard Feynman was an American physicist who lived between 1918-1988. He is famous for his contributions in building the first nuclear bomb and for his work in understanding the way electrons behave....more
Stephen Jay Gould was an American biologist who was born in 1941. He revised Darwin's theory of evolution, showing that it isn't the gradual process everyone had thought. Gould was a professor at Harvard...more
Evelyn Granville is an American mathematician who was born in 1924. She was one of the first black women in the United States to receive a Ph.D. in mathematics. She has helped NASA's Space Shuttle program...more
Stephen Hawking is an English physicist who was born in 1942. He is famous for his work on black holes. Hawking suffers from a very serious illness and is confined to a wheelchair, unable to speak. He...more